Hey there MP, trust a familiar face to respond!
Haven't done anything myself yet, bought the boat with the trawling motor bracket and carpeting on the bow.
Pippo's in Pta quoted R5k for the steering, buoyancy and COF and additional R1000 for a Fiberglass deck/fishing platform on the stern.
Saw a stunning 55hp Merc motor for R14k + R6-7k for mods on the raven and whala, bass boat extraordinaire! I have a 30hp t/a motor and decided to put to use on a duck and save up for a full house BB over the next couple of years.
I'll drop to R2500, but cant do lower, need gear for the duck......